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Power Line Circuits
 

Last Updated: June 02, 2021 01:44 PM

Circuits Designed by Dave Johnson, P.E. :

5v Line-Powered Isolated Supply - Often a circuit requires a 5v DC supply to power some logic circuits.  The conventional method is to use an AC wall adapter.  But, many systems, which bring AC power onto a circuit board, need a small AC to DC power supply right on the circuit board.  The . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2009

Appliance Unplugged Alarm - I received a call from an administrator at a large prison.  He told me that he was having problems with inmates who keep unplugging refrigerators, vending machines and microwave ovens in a commons area.  He wanted a battery-powered device, which could be mounted to the outside of the power cord of an appliance. . . . Hobby Circuit designed by David Johnson P.E.-April, 2010

Miniature 5v Line Powered Isolated Supply - Often a circuit requires a 5v DC supply to power some logic circuits.  The conventional method is to use an AC wall adapter.  But, many systems, which bring AC power onto a circuit board, need a small AC to DC power supply right on the circuit board.  The. . . Circuit by David Johnson P.E.-July, 2009

Modified Cheap Solar LED Path Light - Modification of a typical solar path light with a standard 1000ma-hour NiMH AAA cell.  I then replaced the small 4 cell solar panel with a larger 4 cell unit, which produced 150ma in the sun.  Next, I simply changed the 470uH coil on the circuit board to a 22uH coil.  The lower inductance increased the battery current to 40ma when the LED light was on, which translated to about 13ma LED current.  The light was much brighter. . . Circuit by Dave Johnson P.E.-October, 2012

Tiny 5v Line Powered Isolated Supply - Often a circuit requires a 5v DC supply to power some logic circuits.  The conventional method is to use an AC wall adapter.  But, many systems, which bring AC power onto a circuit board, need a small AC to DC power supply right on the circuit board.  The. . . Circuit by David A. Johnson P.E.-July, 2009

Unplugged Appliance Alarm - I received a call from an administrator at a large prison.  He told me that he was having problems with inmates who keep unplugging refrigerators, vending machines and microwave ovens in a commons area.  He wanted a battery-powered device, which could be mount. . . Circuit by David A. Johnson P.E.-April, 2010


Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students & inventors:

220 Volt Live Wire in Wall Scanner-  This little circuit will help you to scanline of a 220V live wire inwall.  FET gate is connected to a capacitive metal sensor ( which is usually a simple metal plate).  When you holdsensor close towall, LED will indicatecurrent flow around where it detectswire.  Works on 9VDC __ Designed by Peter Jakab

3-Digit DVM IC Measures Power Facto-  04/28/94 EDN Design Ideas:  Circuitry in Fig 1 allows  ICL7106/7107] digital-voltmeter IC, IC4, to measure power factor to0.1% resolution and operate from a single 9Vdc supply.  An important feature of  circuit is that variations in load current, line voltage, Design by Devadoss John and KRS Sarma, Hindustan Cables Ltd, Hyderabad, India

5v Line-Powered Isolated Supply-  Often a circuit requires a 5v DC supply to power some logic circuits.  The conventional method is to use an AC wall adapter.  But, many systems, which bring AC power onto a circuit board, need a small AC to DC power supply right on the circuit board.  The . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2009

Appliance Unplugged Alarm-  I received a call from an administrator at a large prison.  He told me that he was having problems with inmates who keep unplugging refrigerators, vending machines and microwave ovens in a commons area.  He wanted a battery-powered device, which could be mounted to the outside of the power cord of an appliance. . . . Hobby Circuit designed by David Johnson P.E.-April, 2010

Miniature 5v Line Powered Isolated Supply-  Often a circuit requires a 5v DC supply to power some logic circuits.  The conventional method is to use an AC wall adapter.  But, many systems, which bring AC power onto a circuit board, need a small AC to DC power supply right on the circuit board.  The. . . Circuit by David Johnson P.E.-July, 2009

Modified Cheap Solar LED Path Light-  Modification of a typical solar path light with a standard 1000ma-hour NiMH AAA cell.  I then replaced the small 4 cell solar panel with a larger 4 cell unit, which produced 150ma in the sun.  Next, I simply changed the 470uH coil on the circuit board to a 22uH coil.  The lower inductance increased the battery current to 40ma when the LED light was on, which translated to about 13ma LED current.  The light was much brighter. . . Circuit by Dave Johnson P.E.-October, 2012

Tiny 5v Line Powered Isolated Supply-  Often a circuit requires a 5v DC supply to power some logic circuits.  The conventional method is to use an AC wall adapter.  But, many systems, which bring AC power onto a circuit board, need a small AC to DC power supply right on the circuit board.  The. . . Circuit by David A. Johnson P.E.-July, 2009

Unplugged Appliance Alarm-  I received a call from an administrator at a large prison.  He told me that he was having problems with inmates who keep unplugging refrigerators, vending machines and microwave ovens in a commons area.  He wanted a battery-powered device, which could be mount. . . Circuit by David A. Johnson P.E.-April, 2010


Power Line Circuits


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